How wide, almost universal, was the
knowledge that Varro communicated to the world!
What of all that goes to make up the equipment of
an orator was lacking to Cicero? Why should I say
more, since even Cornelius Celsus, a man of very
ordinary ability, not merely wrote about rhetoric in
all its departments, but left treatises on the art of
war, agriculture and medicine as well. Indeed the
high ambition revealed by his design gives him the
right to ask us to believe that he was acquainted
with all these subjects.